This section describes the JAR manifest file, META-INF/MANIFEST.MF, which contains information about the JAR file and its contents.

"manifest" in a JAR file is a file named as META-INF/MANIFEST.MF. It contains attributes about the JAR file and its contents.

Attributes in "manifest" are recorded as a list of name-value pairs in the form of "name: value\n". The list is divided into a main section for package-level attributes and multiple sub sections for entry-level attributes. Note that each attribute must be ended with a new line character.

The main section may contain only the package level attributes like:

Sub sections are optional. They are used to provide entry-level attributes with one section per entry. A sub sections must be preceded with a blank line and started with a "Name" attribute to associate this section with a content entry in the JAR file.

Here is a good example of the manifest file from the "xalan-2.7.2.jar" file:

Manifest-Version: 1.0
Created-By: 1.7.0_51 (Oracle Corporation)
Main-Class: org.apache.xalan.xslt.Process
Class-Path: xercesImpl.jar xml-apis.jar serializer.jar

Name: org/apache/xalan/
Comment: Main Xalan engine implementing TrAX/JAXP
Specification-Title: Java API for XML Processing
Specification-Vendor: Sun Microsystems Inc.
Specification-Version: 1.3
Implementation-Title: org.apache.xalan
Implementation-Version: 2.7.2
Implementation-Vendor: Apache Software Foundation

Name: org/apache/xpath/
Comment: XPath engine
Implementation-Title: org.apache.xpath
Implementation-Version: 2.7.2
Implementation-Vendor: Apache Software Foundation


Last update: 2018.

Table of Contents

 About This Book

 Java Tools Terminology

 Java Tools Included in JDK

 javac - The Java Program Compiler

jar - The JAR File Tool

 JAR - Java Archive File Format

 jar - JAR File Tool Command and Options

 "jar --create" - Creating New JAR File

 "jar --list" - Listing Files in JAR File

 "jar --extract" - Extracting Files from JAR File

 Managing JAR Files with WinZIP



 "jar -C" - Changing Input Directory

 Using JAR Files in Java Class Paths

 "jar --update" - Updating Class Files in JAR

 "jar --main-class" - Making JAR File Executable

 Creating Module JAR File

 "jar --module-version" - Updating Module Version in JAR

 jlink - The JRE Linker

 jmod - The JMOD File Tool

 jimage - The JIMAGE File Tool

 java - The Java Program Launcher

 jdb - The Java Debugger

 jcmd - The JVM Diagnostic Tool

 jconsole - Java Monitoring and Management Console

 jstat - JVM Statistics Monitoring Tool

 JVM Troubleshooting Tools

 jvisualvm (Java VisualVM) - JVM Visual Tool

 jmc - Java Mission Control

 javap - The Java Class File Disassembler

 keytool - Public Key Certificate Tool

 jarsigner - JAR File Signer

 jshell - Java Language Shell

 native2ascii - Native-to-ASCII Encoding Converter

 Outdated Tutorials


 Full Version in PDF/EPUB